> I've bootstrapped and regression tested this on x86_64, though I doubt
> it makes any difference there. BUt I'd bet it would help other targets
> that don't expose double-word operations and have a condition code that
> is clobbered by most instructions.
>
> OK for the trunk?
Sure, thanks.
--
I was reviewing the generated code in libgcc for the H8 to see if there
were any obvious redundant test/compares. Sure enough I found one in
the first file I looked at ;-)
So after IRA we have something like this:
(insn 43 112 44 4 (set (subreg:SI (reg:DI 40) 0)
(and:SI (subreg:SI (re
